[llvm] [Utils] Identity map module-level debug info on first use in CloneFunction* (PR #118627)

[Felipe de Azevedo Piovezan via llvm-commits]

felipepiovezan wrote:

> > ... I would like to test this commit on the swift compiler, since it makes heavy use of metadata cloning and could reveal potential issues. I'll do this asap
> 
> Thanks @felipepiovezan! Out of curiosity, is this about an open source version of swiftlang/swift and swiftlang/llvm-project?

Yup! https://github.com/swiftlang/llvm-project/tree/swift/release/6.1

https://github.com/llvm/llvm-project/pull/118627